#!/usr/bin/env python
# -*- coding: utf-8 -*-

from typing import List, Dict


def complete_answer_statistic(answers: List[Dict[str, int]]) -> List[Dict[str, int]]:
    """
    补全答案统计数据
    """
    answer_set = set(["A", "B", "C", "D"])
    if len(answers) != 4:
        exist_answer_set = set([x["key"] for x in answers])
        lack_answer_set = answer_set - exist_answer_set
        if lack_answer_set:
            answers.extend([{"key": x, "val": 0} for x in lack_answer_set])
    answers.sort(key=lambda x: x["key"])
    return answers